Let's divide 890237 by 81
The aim is to understand the frequency of 81 in 890237.

Advancing to step 1:
81 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 81

Advancing to step 2:
81 can be fit into 89 1 times, resulting in a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 81 away from 89, we end up with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 81

On to step 3:
81 can be fit into 80 0 times, resulting in a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 80 and we're left with 80.
Include the next digit (2) from the dividend after 80, then repeat: 802 / 81

On to step 4:
When dividing 802 by 81, we get 9 with a remainder of 73.
The number 9 becomes the next digit in our result. 
Result so far: 109.0
If we subtract 729 from 802, we get 73.
Append the next digit (3) from the dividend to 73 and continue with: 733 / 81

Going ahead to step 5:
When dividing 733 by 81, we get 9 with a remainder of 4.
The next digit of our result is 9. 
Result so far: 1099.0
If we take 729 away from 733, we end up with 4.
Grab the next digit (7) from the dividend, add it to 4, then carry on: 47 / 81

Going ahead to step 6:
81 can be fit into 47 0 times, resulting in a remainder of 47.
The next digit of our result is 0. 
Result so far: 10990.0
The remainder is 47 after subtracting 0 from 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 7:
The number 81 fits into 470 5 times, leaving a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 10990.5
Subtracting 405 from 470 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 8:
81 goes into 650 8 times with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 10990.58
If we subtract 648 from 650, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 9:
20 divided by 81 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 10990.58
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 10:
81 can be fit into 200 2 times, resulting in a remainder of 38.
Use 2 as the next digit of our solution. 
Result so far: 10990.5802
Subtracting 162 from 200 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 11:
If we divide 380 by 81, we get 4 and a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 10990.58024
Deduct 324 from 380 and we're left with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 12:
If we divide 560 by 81, we get 6 and a remainder of 74.
The next digit of our result is 6. 
Result so far: 10990.580246
If we take 486 away from 560, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 13:
When dividing 740 by 81, we get 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 10990.5802469
Subtract 729 from 740 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 14:
81 can be fit into 110 1 times, resulting in a remainder of 29.
The next digit of our result is 1. 
Result so far: 10990.58024691
Deduct 81 from 110 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Our division results in 10990.58024691 with a remaining 2.9e-08.